I've heard here and there that the Electoral College should be scrapped because it's purpose was to favor the slave states somehow. How was this so? What advantage/disadvantage did the slave states have in the Electoral College system?
Because of these factors slave states had more relative voting power in the EC than they would if a national popular vote was used.
President Lincoln won only 40% of the popular vote. He recieved 180 electoral votes, 69 more than the combined total of the two southern candidates who received a total of 111.
69 EV is about 40% of the total EV in 1860. By comparison in 2016 President Trump won by 77 EV or about 14% of the total EV in 2016.